I know I shouldn't find this odd... but I do.

Radio 4 always goes with the INCIDENTAL MUSIC IN ALAN BENNET DRAMA first
Radio 6 always goes with the SHED SEVEN ALBUM TRACKS/token new artist first
Radio 2 somewhere in between
Radio 1 probably zane lowe’s drum n bass tips, dunno.

I've listened to broadcasts on Radios 4, 6 and 2 within an hour before, and they've all had different music.

If I did any research into this I'm sure I could come up with some cutting-edge sociological theories. But I can't be bothered. Someone else do it for me please?